如果是真分数，那么a最小是 ；如果是假分数，那么a最大是 ．
This novel is very interesting． My brother （read） it three times．
My teacher always gives me some useful （suggest）．
We must be careful to avoid （make） mistakes in the exam．
It's very （polite） to talk loudly in public．
Subways make our lives （easy） than before．
是真分数，那么a最小是 ；如果
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